It is good practice to use a contactor to do electric isolation on a bus

I have an multifilar diagram of LV motors;

I have for each motor a circuitbracker and a contactor,after the bus.

For me this is ok, but for doing isolation of the bus: i have  the income Line and instead of an interrupter i have a contactor,this  for doing pretection (isolate the power of the motores) when a push button is actuated.

This is correct?

It is allow by IEC or another standards

Kind Regards